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fix(build): copy frontendDist to Android assets after cargo tauri build

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Tauri CLI 2.10.x silently skips copying the frontendDist (desktop/dist/)
to gen/android/app/src/main/assets/ on Android builds. The WebView then
fails at runtime with "Asset not found: index.html".

After cargo tauri android build, check if index.html landed in the
Android assets folder. If not (the bug path), copy dist/ manually and
re-run ./gradlew assembleUniversalRelease. Gradle is incremental here
(no Java/Kotlin changed) so the extra pass takes < 30s.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Siavash Sameni
2026-05-25 09:51:48 +04:00
parent bc021517c0
commit 2b93bd4b45
1 changed files with 18 additions and 0 deletions
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18
scripts/build-tauri-android.sh
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@@ -321,6 +321,24 @@ for ARCH in $ARCHS; do
echo ">>> cargo tauri android build ${PROFILE_FLAG} --target $TARGET --apk" echo ">>> cargo tauri android build ${PROFILE_FLAG} --target $TARGET --apk"
cargo tauri android build ${PROFILE_FLAG} --target "$TARGET" --apk cargo tauri android build ${PROFILE_FLAG} --target "$TARGET" --apk
# ─── Workaround: Tauri CLI 2.10.x does not copy frontendDist to the
# Android assets folder (gen/android/app/src/main/assets/). The Rust
# build step writes tauri.conf.json there correctly, but index.html
# and the JS/CSS assets are never transferred, causing the WebView to
# fail with "Asset not found: index.html" at runtime.
#
# Fix: copy dist/ into the assets folder and re-run Gradle so the APK
# picks up the frontend. Gradle is incremental here (no Java/Kotlin
# changed) so this extra pass takes < 30s.
ANDROID_ASSETS="gen/android/app/src/main/assets"
if [ ! -f "$ANDROID_ASSETS/index.html" ]; then
echo ">>> frontend assets missing from Android project — copying dist/ and repackaging"
mkdir -p "$ANDROID_ASSETS"
cp -r /build/source/desktop/dist/. "$ANDROID_ASSETS/"
echo ">>> re-running Gradle assembleUniversalRelease"
(cd gen/android && ./gradlew assembleUniversalRelease 2>&1 | tail -15)
fi
# Copy produced APK with arch suffix # Copy produced APK with arch suffix
BUILT_APK=$(find gen/android -name "*.apk" -newer "$APK_OUTPUT_DIR" -type f 2>/dev/null | head -1) BUILT_APK=$(find gen/android -name "*.apk" -newer "$APK_OUTPUT_DIR" -type f 2>/dev/null | head -1)
if [ -z "$BUILT_APK" ]; then if [ -z "$BUILT_APK" ]; then